Dextran base wrinkle drying compositions



Patented Apr. 11, 1950 N 1 TE D E PATENT *0 F t 2,503,623 DEXTRAN'B'A'SEWRINKLE DRYING COMPOSITIONS .Enrique L. Luaces ,.-0akwood, Ohio,assig-nor to New Wrinkle, .Inc., Wilmington, Del., a. corporation ofDelaware 1N0 Drawing. Original application February S,

1946, S-eriaLNo. 646,507. .iDividedandithisrapplication May #210, :1949,Serial No. 194,504

\ 4 Claims. 11

This invention relates to coating composition, and vmore particularlydeals. with coating .compositions adaptedto .dry to a wrinkle.

This application. is .a division of Enrique 'L. Luaces application.SerialNo. 646,507,.filedEebruary 8, .1946, .Patent .No. 2,490,070,entitled Dextran base wrinkle drying compositions.

Generally speaking, wrinkle drying coating compositions are divided intotwo types: the varnish. type and the alkyd type.

Varnish type wrinkle drying coating compositionsconsistessentially of avarnish base includ- .2 with wrinkling oils for producing wrinkle dryingcoating compositions is new in the .art; in fact, ithas been hither-toconsidered impossible to use derivatives of dextran in wrinkle dryingcoating compositionsof any .sort .becausesuch derivatives wereconsideredas inhibitors of wrinkle .formaing a wrinkling. oil .inadmixture with drier and solvent; while alkydbase'wrinkle drying coatingcompositions consist essentially of an alkyd resin in admixture withdrier and a solvent.

The productionof both varnishbase and alkyd base wrinkledrying coatingcompositions requires the use .of cooking facilities; however, recentdevelopments .have brought about a .new type of wrinkle drying.coatingcomposition in the production of which the cooking step iseliminated. In.

other words, such .coating compositions are prepared by compounding thecomponent parts thereof without the necessity of cooking.

The present invention deals with .a wrinkle drying coating compositionwhich falls within the latter category. According to the presentinvention .a wrinkling .oil (that is to say,.an .oil which includesconjugated double bonds in its chemical structure) is admixed with asolution of a dextran derivative suchas dextran benzyl ether or dextranacetate in a .ratio of from to.5.0 parts of dextran derivative to each.100 parts .01 wrinkling oil.

To the resulting'mixture maybe added, ifso desired, from 40 to 80% of apigment paste com-- prising, for example, /3; pigment and wrinkling oilby weight. This pigment paste is thorbughly blended into the mixture ofdextran derivative and wrinkling oil to produce a homogeneouscomposition.

To this homogeneous composition is added a quantity of thinner such asnaphtha, toluol, xylol, or mixtures thereof, or any other solvent ormixture of solvents such as customarily employed in varnishformulations, in quantities sufficient to produce a coating of thedesired viscosity.

For example, a coating of suitable viscosity for application byspreading, as with a doctor blade, may consist of 40 parts by weight ofdextran benzyl ether, 100 parts by weight of wrinkling oil, 60 parts byweight of pigment paste, and 10 parts by weight of naphtha.

The use of dextran derivatives in admixture tion.

The texture of the wrinklepatternobtained according to the present.invention may be controlled or altered by selectionnf the typeoidextran derivative used. .In addition, wrinkle patterns and textureshitherto unobtainable may be produced by the simple expedient of varyingthe amount of dextran. derivative employed in the formulation. .Inaddition, thisnew type of wrinkle drying coating composition includingdextran derivative responds to temperature variations during the initialdrying or texturing period to such an extent .that great variety oftextures or patterns maybe obtained.

It is believed that the underlying theory concerning the production .ofwrinkledrying coating composition including derivatives of dextran. isas follows:

The mixture .of dextran derivatives and wrinkling oil consists .of twocomponents which are compatible with each other; however, during thedrying or film-forming period these ingredients separate into distinctphases, and thereby the textureof the wrinkle patternis altereddepending on the relative proportion .or ratio of the two componentparts. It will be understood, of course, that this theory is offeredmerely in explanation of observed facts, and that it is .not intendedthereby to limit this invention.

Dextran is a polysaccharide produced by the action of micro-organisms ona suitable culture medium.

Asa specific example, aculture medium contaming-sucrose in.-thef0rm.of,either refined or crude sugar, molasses or the like, togetherwith nitrogen in the form of commercial peptone, beef extract or othersimilar material, and salts such as dipotassium phosphate and sodiumchloride is inoculated with Leuconostoc mesenterioz'des or Leuconostocdextmnicum. A typical medium may contain 5 to 10% of sucrose, 0.1% ofpeptone, 0.2% of dipotassium phosphate and 0.1% of sodium chloride. ThepH of the medium is adjusted preferably slightly on the alkaline side ofneutrality.

The inoculated culture may be incubated at a temperature most favorableto the growth of the micro-organism being used. For L. mesenterioides atemperature of about 25 C. is suitable,

3 When the fermentation has been completed the polysaccharide formed isprecipitated from the culture by the addition thereto of alcohol oracetone. The precipitate may be purified by further washing with alcoholor acetone.

Ethers and esters of dextran are prepared either from the precipitatedpolysaccharide or from the fermented culture. For example, alkyl oraralkyl derivatives may be prepared by reacting either with alkyl oraralkyl halide in the presence of sodium hydroxide in the ratio of 1mole of polysaccharide to 3.5 mols of the halide and 4.5 mols ofhydroxide.

The method of making ether alkylations comprises the introduction of .analkyl radical by substitution or addition. For this purpose there may beemployed any of the large number of compounds including alkyl radicalssuch as methyl, ethyl, propyl, butyl, amyl and hexyl. The aralkyl orbenzyl radical as wellas the unsaturated allyl group may be introduced.

Organic halides of the aliphatic series such as methyl chloride, ethylchloride, propyl or isopropyl chloride, butyl chloride or any of itsisomers or any member of the aralkyl series such as benzyl chloride, maybe employed.

The following derivatives of dextran have been used successfully in thepractice of the present invention: dextran benzyl ether, dextran butylether, dextran betahydroxy ethyl ether, dextran ethyl ether, mixeddextran benzyl and butyl ethers, mixed dextran betahydroxy ethyl andbenzyl ethers, and dextran acetate.

Any of these derivatives of dextran may be employed in ratios of to 50parts thereof to each 100 parts of wrinkling oil. The dextran productsare employed preferably in solution of a solvent therefore which iscompatible with the solvent dilpractice of this invention, it is notintended thereby to have this invention limited to or cir- V cumscribedby the specific details of materials,

- proportions, or conditions herein specified, in view of the fact thatthis invention may be modified according to individual preference orconditions without necessarily departing from the spirit of thisdisclosure and the scope of the appended uent to be added ultimately tothe coating composition which results from the mixing of the dextranderivatives with the wrinkling oil.

As has been noted hereinbefore, wrinkling oils are oils which includeconjugated double bonds in their chemical structure. They may be nativeoils such as tung oil and oiticica oil, or they may be modified oilssuch as dehydrated castor oil (either blown or unblown), blown linseedoil and alkali isomerized oils prepared from normally non-drying oilssuch as peanut oiland cottonseed oil, or they may be any other type offatty oil which includes conjugated double bonds in its chemicalstructure either in the native state or after treatment causingconjugation of isolated double bonds.

Wrinkle drying coating compositions made according to the method of thisinvention have been successfully applied on paper, fabric, and othersimilar flexible materials with great success. The composition has beenapplied by spraying, spreading, and rolling, and the resulting film hasclaims.

I claim: 1. As a new composition of matter, a wrinkle drying coatingcomposition consisting of a wrinkling oil and a mixture of dextranethers in proportion of 100 parts by weight of wrinkling oil and from 10to 50 parts by weight of dextran ethers, said dextran ethers beingselected from the group consisting of a mixture of dextran benzyl etherplus dextran butyl ether and a mixture of dextran betahydroxyl ethylether plus dextran benzyl ether and said ingredients being admixed atroom temperature.

2. As a new composition of matter, a wrinkle drying coating compositionconsisting of a wrinkling oil and a mixture of dextran benzyl ether plusdextran butyl ether admixed at room temperature in proportions of 100parts by weight of wrinkling oil and from 10 to 50 parts by Weight ofsaid dextran ethers.

3. As a new composition of matter, a wrinkle drying coating compositionconsisting of a wrinkling oil and a mixture of dextran betahydroxy ethelether plus dextran benzyl ether admixed at room temperature inproportions of 100 parts,

by weight of wrinkling oil and from 10 to 50 parts by weight of saiddextran ethers.

4. The method of making a wrinkle drying coating composition whichcomprises admixing a wrinkling oil with a mixture of dextran ethersselected from the group consisting of a mixture of dextran benzyl etherplus dextran butyl ether and a mixture of dextran betahydroxy ethylether plus dextran benzyl ether in proportions of from 10 to 50 parts byweight of said dextran ethers to each 100 parts by weight of wrinklingoil, adding thereto approximately 50 to parts by weight of pigment pasteconsisting of pigment and wrinkling oil by weight, and adding to theresulting mixture a thinner, the entire process being carried out atroom temperature.

ENRIQUE L. LUACES.

No references cited.

1. AS A NEW COMPOSITION OF MATTER, A WRINKLE DRYING COATING COMPOSITIONCONSISTING OF A WRINKLING OIL AND A MIXTURE OF DEXTRAN ETHERS INPROPORTION OF 100 PARTS BY WEIGHT OF WRINKLING OIL AND FROM 10 TO 50PARTS BY WEIGHT OF DEXTRAN ETHERS, SAID DEXTRAN ETHERS BEING SELECTEDFROM THE GROUP CONSISTING OF A MIXTURE OF DEXTRAN BENZYL ETHER PLUSDEXTRAN BUTYL ETHER AND A MIXTURE OF DEXTRAN BETAHYDROXYL ETHYL ETHERPLUS DEXTRAN BENZYL ETHER AND SAID INGREDIENTS BEING ADMIXED AT ROOMTEMPERATURE.